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The main advantages of twin-screw over single-screw extruders are:• However, the stresses due to the stretching flow can exceed the frictional force between the rubber and the metal surface of the roll and in such cases the rubber will not then flow into the nip.

High moisture and sticky materials can be handled.

The principles of screw design are not only important in designing new extruder screws, but also in the analysis of processing problems of an existing extrusion line.

When using high secondary feed rates downstream, a proper screw design is necessary to handle the high rates and accomplish the extrusion objectives of melting if required and mixing.

Chris Rauwendaal, in , 2001 CONCLUSIONS Mixing devices that split and reorient the fluid while generating strong elongational flow can achieve both efficient distributive and dispersive mixing.

The extrusion conditions affect crystallization behavior and molecular weight of the polymer in its final product form.

On the negative side, the relative disadvantages of the twin-screw extruder are:• Anshuman Shrivastava, in , 2018 5.

Some additional mixing elements for single-screw extruders The additional geometrical complexities of these devices for improving mixture quality make any analyses very difficult.

The usual screw configuration has 20 or more turns with a pitch similar to the diameter, giving a long slender machine in which substantial longitudinal temperature gradients can be maintained and controlled.

A drive, usually with speed variation capability and torque control.